I love QR codes, I even own a business surrounding it - iQRazycodes.com - if you guys want a SA discount, let me know
The truth is, if you don't know how to use your QR code properly, it's useless. Also, black and white QR codes are officially out-dated, so spend a little time in Photoshop "prepping" your codes. You can distort ANY qr code up to 30% That's a huge amount of "space" to play around with.
Most of my clients - overseas- use their QR codes on packaging. On their flyers/business cards/sales materials.
You can not only send them to a link, you can send them to sign up for your email list, sms list, purchase a product, like a page, share a "tweet", watch a video, go on a virtual tour... as long as you make an action easier for your customer, you're winning big!